QUESTION NO: 9
Which two of the addresses below are available for host addresses on the subnet
192.168.15.19/28? (Select two answer choices)
下列地址中，属于192.168.15.19/28子网的有效主机地址是哪两个？

A. 192.168.15.17
B. 192.168.15.14
C. 192.168.15.29
D. 192.168.15.16
E. 192.168.15.31
F. None of the above

解析：192.168.15.19/28 的子网掩码是 255.255.255.240 这是16个子网中的一个，这16个子网是
192.168.15.0
192.168.15.16
192.168.15.32
..........
192.168.15.240
B不在该网段，D是子网号，E倒是在本网段，但是个广播地址。

Answer: A, C

以后天天来顶你 ！

QUESTION NO: 10
You have a Class C network, and you need ten subnets. You wish to have as many
addresses available for hosts as possible. Which one of the following subnet masks
should you use?
将一个C类网络划分子网,希望可以得到尽可能多的可用主机地址,应该使用下列哪个方案?

A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248
E. None of the above

解析:对于一个C类网址,可以划分的情况有:



答案:C

QUESTION NO: 11
Which of the following is an example of a valid unicast host IP address?
下列地址中那一个是一个合法的单播地址?

A. 172.31.128.255./18
B. 255.255.255.255
C. 192.168.24.59/30
D. FFFF.FFFF.FFFF
E. 224.1.5.2
F. All of the above

解析:本题考察单播,多播,广播的地址概念
B是广播地址 C是192.168.24.56/30子网的广播地址,D是二层广播地址,E是组播地址

答案:A

QUESTION NO: 12
How many subnetworks and hosts are available per subnet if you apply a /28 mask
to the 210.10.2.0 class C network?
如果你将28位子网掩码赋予C类网络210.10.2.0,我们会得到多少各子网,每个子网多少个主机?

A. 30 networks and 6 hosts.
B. 6 networks and 30 hosts.
C. 8 networks and 32 hosts.
D. 32 networks and 18 hosts.
E. 16 networks and 14 hosts.
F. None of the above

解析:对C类网址210.10.2.0来说,默认子网掩码是24位,现在从主机位又拿了4位,那么子网数为16个,而每个子网的主机数目应该是16-2=14个

答案:E

参考
http://sharecenter.net/viewthrea ... 3%CD%F8%BC%C6%CB%E3

QUESTION NO: 13
The TestKing network was assigned the Class C network 199.166.131.0 from the
ISP. If the administrator at TestKing were to subnet this class C network using the
255.255.255.224 subnet mask, how may hosts will they be able to support on each
subnet?
ISP分配给TK公司的网络地址是一个C类地址:199.166.131.0,如果公司管理员准备使用255.255.255.224作为子网掩码来对本网段划分子网,那么

每一个子网内可以有多少个主机?

A. 14
B. 16
C. 30
D. 32
E. 62
F. 64

解析:用了3位划分子网,留下5位给主机,所以可用主机数目为:2的5次方-2

Answer: C

谢谢楼主分享LZ

有把这些题整理在一起的的吗？？

直接下载了比这样方面多了~~

这些是TestKing最新题库,大约1000多,短时间内全部翻译过来很难.

QUESTION NO: 14
What is the subnet for the host IP address 172.16.210.0/22?
某主机地址为172.16.210.0/22,它所在的子网地址是什么?

A. 172.16.42.0
B. 172.16.107.0
C. 172.16.208.0
D. 172.16.252.0
E. 172.16.254.0
F. None of the above

解析:本题考察子网掩码的与运算概念
IP address 172.16.210.0 = 10101100.00010000.11010010.00000000
/22 mask = 11111111.11111111.11111100.00000000
AND result = 11111111.11111111.11010000.00000000
AND in decimal= 172 . 16 . 208 . 0

Answer: C

这个贴继续走下去啊
老赵我来看你了　

第一次见识到CCNA的题目，还好，不是太难！

QUESTION NO: 15
What is the subnet for the host IP address 201.100.5.68/28?
IP地址201.100.5.68/28的子网地址是什么?

A. 201.100.5.0
B. 201.100.5.32
C. 201.100.5.64
D. 201.100.5.65
E. 201.100.5.31
F. 201.100.5.1

解析:和上题一样考察子网掩码的与运算
IP address 201.100.5.68 = 11001001.01100100.00000101.01000100
/28 mask = 11111111.11111111.11111111.11000000
AND result = 11001001.01100100.00000101.01000000
AND in decimal= 200 . 100 . 5 . 64

Answer: C

QUESTION NO: 16
Exhibit:
3 addresses are shown in binary form in the exhibit.
Regarding these three binary addresses in the above exhibit; which statements below are correct? (Select three)



上图显示了3个二进制方式的地址,关于这三个地址说法正确的是?

A. Address C is a public Class C address.
B. Address C is a private Class C address.
C. Address B is a public Class B address.
D. Address A is a public Class A address.
E. Address B is a private Class B address.
F. Address A is a private Class A address.

解析:本题考察共有地址和私有地址的概念，先转化为十进制再看
A. 192.167.178.69 C类地址
D. 100.10.235.39 A类地址
E. 172.18.158.15 私有地址
Answer: A, D, E

QUESTION NO: 17
What is the IP address range for the first octet in a class B address, in binary form?
以二进制表示的B类地址的前八位组范围是那个?

A. 00000111-10001111
B. 00000011-10011111
C. 10000000-10111111
D. 11000000-11011111
E. 11100000-11101111
F. None of the above

解析:B类地址是128.0.0.0到191.255.255.255,分别将128和191变成二进制为10000000和10111111

Answer: C

QUESTION NO: 18
Which one of the binary bit patterns below denotes a Class B address?
下面那个二进制代表了B类地址的起始位

A. 0xxxxxxx
B. 10xxxxxx
C. 110xxxxx
D. 1110xxxx
E. 11110xxx

解析:见上题
Answer: B

楼主的想法不错,不但每天一天题知识有进张,英语也得到了锻炼,very good, 3Q!

QUESTION NO: 19
The TestKing network consists of 5 different departments as shown below:
You are a systems administrator at TestKing and you've just acquired a new Class
C IP network. Which of one of the subnet masks below is capable of providing one
useful subnet for each of the above departments (support, financial, sales &
development) while still allowing enough usable host addresses to meet the needs of
each department?


如图,TestKing公司的网络包括五个不同的部门,作为系统管理员的你刚刚得到一个新的C类地址,如何划分子网掩码可以提供足够多的可用主机地址来满足不同部门的需要?
A. 255.255.255.128
B. 255.255.255.192
C. 255.255.255.224
D. 255.255.255.240
E. 255.255.255.248
F. 255.255.255.252

解析:从图中可以看出,人数最多的开发部需要16个IP地址,因此主机位至少是5位,才能让每个子网的可用主机总数为(2的5次方-2)个

答案:C

QUESTION NO: 20
Your network uses the 172.12.0.0 class B address. You need to support 459 hosts per
subnet, while accommodating the maximum number of subnets. Which mask would
you use?

你的网络使用B类地址172.12.0.0,划分子网时每个子网需要支持459台主机,你应该应用哪个子网掩码?

A. 255.255.0.0.
B. 255.255.128.0.
C. 255.255.224.0.
D. 255.255.254.0.

解析:每个子网需要支持459台主机,看来主机位需要9位,作为B类地址,默认掩码是255.255.0.0,从后面向前留9位主机号便可

答案

QUESTION NO: 21
Using a subnet mask of 255.255.255.224, which of the IP addresses below can you
assign to the hosts on this subnet? (Select all that apply)
对于子网掩码255.255.255.224,下列哪些IP地址可以使用?

A. 16.23.118.63
B. 87.45.16.159
C. 92.11.178.93
D. 134.178.18.56
E. 192.168.16.87
F. 217.168.166.192

解析:对于子网掩码255.255.255.224来说,分出的各个子网最后个八位组应该是(0, 32, 64, 96, 128, 160, 192, 224)分别查看每个选项
发现
A是16.23.118.32子网的广播地址
B是87.45.16.128子网的广播地址
F是217.168.166.192子网的广播地址

Answer: C, D, E

QUESTION NO: 22
Your ISP has assigned you the following IP address and subnet mask:
IP address: 199.141.27.0
Subnet mask: 255.255.255.240
Which of the following addresses can be allocated to hosts on the resulting subnet?
(Select all that apply)
你的ISP分配给你的IP地址和子网掩码为:
IP address: 199.141.27.0
Subnet mask: 255.255.255.240
下列那些主机地址属于本子网
A. 199.141.27.2
B. 199.141.27.175
C. 199.141.27.13
D. 199.141.27.11
E. 199.141.27.208
F. 199.141.27.112
解析:IP地址是C类地址,默认掩码应该是255.255.255.0.既然这里掩码变成255.255.255.240,说明划分了子网,给我们的IP是某一个子网
先将所有子网列出来
256-240=16
子网为
199.141.27.0
199.141.27.16
199.141.27.32
....
199.141.27.240
答案中只有ACD属于本子网
Answer: A, C, D